THE MAJOR FACTORS CONNECTED WITH HUMAN MADE ACTIVITY
Many factors connected with human made activity have negative effect on such a serious environmental crisis as global warming. It is known that the gradual increase in the earth and ocean temperatures is “the result of the build -up of certain gases which trap heat in the atmosphere causing the earth to warm up. These heat-trapping gases are also called greenhouse gases” (Roshard, 2007, para.1).
The greenhouse gases that are contributed to the atmosphere in the result of human activity include the carbon dioxide, nitrous oxide, CFCs and methane. It is known that carbon dioxide or CO2 is emitted into the atmosphere when people use such fossil energies as coal, gas and oil. About 20 tons of carbon is burned every year in the world (Maslin, 2008, p.11). Methane or CH4 is another greenhouse gas which also contributes to the increases in temperatures on the planet. Its sources include not only paddy fields and garbage dumps, but also bovine farms and the use of gas and oil. The third greenhouse gas is nitrous oxide or N2O which is emitted from fertilizers (Rosser, 2008, p.21).
The intensive development of industry leads to the increased level of gas emission. For example, it is known that today agriculture has increased the level of nitrous oxide because of the intensive use of different fertilizers as well as the level of methane because of animal farming (Maslin, 2008, p.23). Moreover, such products as aerosols used in the past by millions of people throughout the world have contributed to the increased levels of CFCs. Besides, the use of different fossil fuels has increased the amount of carbon dioxide in the atmosphere (Rosser, 2008, p.14). Power plants are considered to be the main sources of carbon dioxide which is produced during the burning process of fossil fuel in order to generate electricity. According to the statistical data, burning gasoline in cars and other vehicles emits about 20% of carbon dioxide into the atmosphere (Rosser, 2008, p.12).
One more factor that influences the natural balance of gases in the atmosphere is deforestation. Deforestation is “the loss or destruction of forest habitat, primarily as the result of the action of human beings” (Rosser, 2008, p.26). It is known that trees and plants can absorb carbon dioxide during the process of photosynthesis that is why deforestation increases the level of carbon dioxide in the atmosphere.
Another factor that contributes to global warming is the fact that human population on the planet is constantly growing. It leads to the increase in fuel usage in different spheres of human activity, including transportation, energy and power industry, increased deforestation to provide additional area for agriculture and so on (Maslin, 2008, p.31).
Besides the above mentioned factors, there is one more factor related to human activity – the existence of solid domestic waste landfills. Landfills are known as the emitters of methane not only in the United States, but also in other countries of the world. When waste in the landfills decomposes in anaerobic conditions, a large amount of methane is generated. Thousands of tons of industrious hazardous wastes contaminate both the soil and the air and create a serious emission problem that contributes to global warming (Maslin, 2008, p.41).
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